511 . Metacentric height is given as the distance between
- A. the center of gravity of the body and the meta center
- B. the center of gravity of the body and the center of buoyancy
- C. the center of gravity of the body and the center of pressure
- D. center of buoyancy and metacenter.
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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512 . Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
- A. 9 times
- B. 1/9 times
- C. 1/3 times
- D. 3 times
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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513 . Pure iron is the structure of
- A. ferrite
- B. pearlite
- C. anstenite
- D. ferrite and cementite
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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514 . The metallic structure of mild steel is
- A. body centred cubic
- B. face centred cubic
- C. hexagonal close packed
- D. cubic structure
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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515 . In a circuit a 33 Q resistor carries a current of 2 A.. The voltage across the resistor is
- A. 33 V
- B. 66 V
- C. 80 V
- D. 132 V
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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516 . The weight of a body is due to
- A. gravitational pull exerted by the earth
- B. forces experienced by body in atmosphere
- C. force of attraction experienced by particles
- D. gravitational force of attraction towards the center of the earth.
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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517 . Kinematic viscosity is dependent upon
- A. pressure
- B. distance
- C. flow
- D. density
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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518 . The increase of temperature results in
- A. increase in viscosity of gas
- B. increase in viscosity of liquid
- C. decrease in viscosity of gas
- D. decrease in viscosity of liquid
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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519 . A pressure of 25 m of head of water is equal to
- A. 25 kN/m2
- B. 245 kN/m2
- C. 2500 kN/m2
- D. 2.5kN/m2
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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520 . The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
- A. TOD > BOD > COD
- B. TOD > COD > BOD
- C. BOD > COD > TOD
- D. COD > BOD > TOD
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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521 . Alum as a coagulant is found to be most effective when pH range of water is
- A. 2 to 4
- B. 4 to 6
- C. 6 to 8
- D. 8 to 10
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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522 . The polluted water is one which
- A. contains pathogenic bacteria
- B. Consists of undesirable substances making it unfit for its best use i.e. drinking
- C. is safe and suitable for drinking and domestic use
- D. is contaminated
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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523 . The devices which are installed for drawing water from the sources are called
- A. aquifers
- B. aquiclude
- C. filters
- D. intakes
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Dhaka WASA Supply & Sewerage Authority (DWASA) || Assistant Engineer (02-03-2024) || 2024
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524 . If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be
- A. 100000m3
- B. 150000m3
- C. 180000m3
- D. 270000 m3
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